#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() 
{
    int h = 0;
    int r = 0;
    scanf("%d %d", &h, &r);
    float v = 3.14 * h * r * r;
    int c = 10000;
    int d = 0;
    while (c > 0) 
    {
        c = c - v;
        d++;
    }
    printf("%d\n", d);

    return 0;
}